1、手工改变数据文件的大小

SQL>conn / as sysdba

SQL>Createtablespace exampletb Datafile 'E:\ examp01.dbf' size 10M ;

SQL>alter database datafile 'E:\examp01.dbf' resize 20m;

SQL>alter database datafile 'E:\examp01.dbf' resize 9m;

2、添加数据文件到表空间

SQL> alter tablespace exampletb add datafile 'E:\ examp02.dbf' size 10M;

3、从表空间中删除数据文件

SQL> alter tablespace exampletb drop datafile 'E:\ examp02.dbf';

4、将表空间设置为只读模式和读写模式

SQL>CREATETABLE scott.student (id NUMBER(5), name VARCHAR2(10)) TABLESPACE exampletb;

SQL>insertinto scott.student(id,name) values(1, 'lucy');

SQL> alter tablespace exampletb read only；

SQL>insertinto scott.student(id,name) values(2, 'lily');

SQL>select* from scott.student;

SQL> alter tablespace exampletb read write；

SQL>insertinto scott.student(id,name) values(2, 'lily');

5、 将表空间设置为在线和离线

SQL> alter tablespace exampletb offline;

SQL>select* from scott.student;

SQL> alter tablespace exampletb online;

SQL>select* from scott.student;

6、查询表空间和数据文件

SQL>select * from v$tablespace;

SQL>select * from dba_tablespaces;

SQL>select * from v$datafile;

SQL> select * from dba_data_files;